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P. R. BAUER.

DOOR CLOSER.

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UNITED STATES PATENT OFFICE.

FRIEDRICH R. BAUER, OF NEW YORK, Y., ASSIGNOR TO GOTTFRIEDFRIEDRICH-WILHELM JOSEPH STEMANN, OF HAMBURG, AND MORITZ PHILIPP CARLFRIEDRICH AUGUST SEEBOLD, OF BERLIN, GERMANY.

DOOR-CLOSER.

SPECIFICATION forming part of Letters Patent No. 529,101, dated November13, 1894. Application filed February 19, 1894. Serial No. 500,742- (Nomodel.)

To all whom it may concern.-

Be it known that I, FRIEDRICH RICHARD BAUER, a subject of the GermanEmperor, residing in the-city of New York, county and State of New York,haveinvented certain new and useful Improvements in Apparatus forClosing Doors, of which the following is a specification. I

My invention relates to an automatic apparatus for closing doors, whichcomprises a spring-actuated push-rod arranged in the upper edge of thedoor and which, on the latter being opened,is moved back in thedirection of the door edge by means of a draw-rod adapted to turn on thedoor case. The operation of the draw-rod, that is to say the backmovement of the same relatively to the door which opens, takes place inconsequence of the cocentric position of the pivot of the draw-rod withregard to the pivot of the door. At the commencement of the openingmovement, when the back movement of the draw-rod is but slight, thisback movement is aided by means of a special cam, the action of whichcauses the pivot of the draw-rod to be displaced toward the pivot of thedoor so that the eccentricity of the two pivots diminishes. By thismeans I obtain a more uniform distribution and better utilization of thespring power acting upon the push-rod.

In the accompanying drawings, in which similar letters denote similarparts: Figure l is a sectional side elevation of my improved doorclosing apparatus, fastened to a door and the door-case belongingthereto and in its position of rest, that is to say, when the door isclosed. Fig. 2 is a similar view, but in a positionin which the door ispartly opened. Fig. 3 is a top view of Fig. 2, and Fig. at is a detail.

The push-rod a which may be let into the upper edge of a door A andadapted to be displaced on a bar (2, namely by means of a pin a slidingin a slot of the bar I) and an eye 1). Between these two parts is aspring 0 which surrounds the push-rod a and tends to press the latterout of the eye I) (Fig. 1). The head of the pin a is embraced byadraw-rodd having a pivot d at its other end which is fitted to turn in asliding-piece e which can move in a slot formed in a bar f secured tothe doorcase B. On a square of the pivot d of the said draw-rod Iprovide a cam 9 bearing against a pressing roller h.

When for the purpose of opening it the door A is turned upon its pivott' the said cam g-firmly connected with the pivot d of the draw-rod, isalso caused to turn so that instead of its recess g the full part of thesame will bear against the pressing roller h which is immovably arrangedon the barf fixed to the door-case. By this means the cam g, pivotd','sliding piece 6, draw-rod d and push-rod a are moved back againstthe pressure of the spring surrounding this push-rod, until the slidingpiece strikes against the end of the slot in the barfsecured to thedoor-case. At this state the several parts are occupying the positionsshown in Figs. 2 and 3. In the further opening of the door the backmovement of the draw-rod d and push-rod a relatively to the door takesplace solely in consequence of the eccentric position of the aforesaidtwo pivots d and 'i, the push-rod being pulled back a distance equal tothat between the two pivots until the door is quite open, as illustratedby dotted lines Fig. 3.

The door is automatically closed by the compressed spring 0 whichsurrounds the pushrod causing all the parts to move back in the reverseorder to that in which they move when the dooris opened. The latter issufficiently secured in its closed position by the pressing roller hengaging with the recess 9' in the cam g.

Having fully described my said invention, what I claim and desire tosecure by Letters Patent, is

1. The combination of a pivoted door, a

spring actuated push-rod movably connected to the edge of said door, adraw rod connected at one end to said push-rod and provided at itsopposite end with a pivot, said pivot being guided in a slot of a barsecured to the doorcase, said pivot being disposed eccentrically to thepivot of the door, a cam adapted to bear against a pressing rollerfastened to the door case.

2. The combination of a door having a recess in the edge thereof, a barsecured to the ICC 10 site end with a pivot fitted to turn in a slidingpiece attached to the door case, a cam disposed on said pivot, and apresser roller secured to the door case and adapted to engage said cam.

In testimony that I claim the foregoing as my invention I have signed myname in presenee of two subscribing Witnesses.

FRIEDRICH R. BAUER.

Wit n esses:

PAUL GoEPEL, K. R. BRENNAN.

